gnu: breeze: Split from breeze-icons.

KDE breeze is separate from breeze-icons, as it can bee seen by
version, download path and git repository path being all different.
Thus a package containing both beeze and the breeze-icons contradicts
with this upstream separation.

* gnu/package/kde.scm (breeze-assets): Remove variable. (breeze): Move to ...
* gnu/package/kde-plasme.scm (breeze): here.
  [version, source]: Copy from former breeze-assets.
  [build-system]: Make explicit (was inherited even from breeze-icons).
  [arguments]: Remove.
  [native-inputs]: New element.
  [inputs]: Copy from former breeze-assets; add some optional packages.
  [home-page]: Fix and change to invent.kde.org.
  [snopysis, description]: Adjust to de-unified package.
  [licence]: Remove gpl3+, which came from breeze-icons.

gnu/packages/kde-frameworks.scm

@@ -327,63 +327,6 @@ It is the default icon theme for the KDE Plasma 5 desktop.")
     ;; text.
     (license license:lgpl3+)))
 
-(define-public breeze-assets
-  (package
-    (inherit breeze-icons)
-    (name "breeze-assets")
-    (version "5.19.5")
-    (source (origin
-              (method url-fetch)
-              (uri (string-append
-                    "mirror://kde/stable/plasma/" version
-                    "/breeze-" version ".tar.xz"))
-              (sha256
-               (base32
-                "0dpk1w7zcafrzf46j060i1qb0fwqpsflkfzr6gcar81llmjnc4b1"))))
-    (inputs
-     `(,@(package-inputs breeze-icons)
-       ("ki18n" ,ki18n)
-       ("kpackage" ,kpackage)
-       ("kguiaddons" ,kguiaddons)
-       ("kdecoration" ,kdecoration)
-       ("kcoreaddons" ,kcoreaddons)
-       ("kiconthemes" ,kiconthemes)
-       ("kwindowsystem" ,kwindowsystem)
-       ("kconfigwidgets" ,kconfigwidgets)
-       ("qtx11extras" ,qtx11extras)))
-    (home-page "https://github.com/KDE/breeze")
-    (synopsis "Artwork, styles and assets for the Breeze visual style")
-    (description "This package contains artwork, styles and assets associated
-with the Breeze visual style.")
-    (license license:gpl2+)))
-
-(define-public breeze
-  (package
-    (name "breeze")
-    (version (package-version breeze-assets))
-    (source #f)
-    (build-system trivial-build-system)
-    (arguments
-     `(#:modules ((guix build union))
-       #:builder
-       (begin
-         (use-modules (ice-9 match)
-                      (guix build union))
-         (match %build-inputs
-           (((names . directories) ...)
-            (union-build (assoc-ref %outputs "out")
-                         directories)
-            #t)))))
-    (inputs
-     `(("breeze-icons" ,breeze-icons)
-       ("breeze-assets" ,breeze-assets)))
-    (home-page "https://github.com/KDE/breeze-icons")
-    (synopsis "Full KDE Breeze theme")
-    (description
-     "This package contains the full Breeze visual style for KDE:
-assets and icons.")
-    (license (list license:gpl2 license:gpl3+))))
-
 (define-public kapidox
   (package
     (name "kapidox")

gnu/packages/kde-plasma.scm

@@ -2,7 +2,7 @@
 ;;; Copyright © 2016 Thomas Danckaert <post@thomasdanckaert.be>
 ;;; Copyright © 2018 Meiyo Peng <meiyo.peng@gmail.com>
 ;;; Copyright © 2019 Marius Bakke <mbakke@fastmail.com>
-;;; Copyright © 2017 Hartmut Goebel <h.goebel@crazy-compilers.com>
+;;; Copyright © 2017, 2019, 2020 Hartmut Goebel <h.goebel@crazy-compilers.com>
 ;;; Copyright © 2019 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;;
 ;;; This file is part of GNU Guix.
@@ -35,6 +35,53 @@
   #:use-module (gnu packages qt)
   #:use-module (gnu packages xorg))
 
+(define-public breeze
+  (package
+    (name "breeze")
+    (version "5.19.5")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "mirror://kde/stable/plasma/" version "/"
+                                  name "-" version ".tar.xz"))
+              (sha256
+               (base32
+                "0dpk1w7zcafrzf46j060i1qb0fwqpsflkfzr6gcar81llmjnc4b1"))))
+    (build-system qt-build-system)
+    ;; TODO: Warning at /gnu/store/…-kpackage-5.34.0/…/KF5PackageMacros.cmake:
+    ;;   warnings during generation of metainfo for org.kde.breezedark.desktop:
+    ;;   Package type "Plasma/LookAndFeel" not found
+    ;; TODO: Check whether is makes sence splitting into several outputs, like
+    ;; Debian does:
+    ;; - breeze-cursor-theme
+    ;; - "out", "devel"
+    ;; - kde-style-breeze - Widget style
+    ;; - kde-style-breeze-qt4 - propably not useful
+    ;; - kwin-style-breeze
+    ;; - qml-module-qtquick-controls-styles-breeze - QtQuick style
+    (native-inputs
+     `(("extra-cmake-modules" ,extra-cmake-modules)
+       ("pkg-config" ,pkg-config)))
+    (inputs
+     `(("kcmutils" ,kcmutils) ; optional
+       ("kconfigwidgets" ,kconfigwidgets)
+       ("kcoreaddons" ,kcoreaddons)
+       ("kde-frameworkintegration" ,kde-frameworkintegration) ; optional
+       ("kdecoration" ,kdecoration)
+       ("kguiaddons" ,kguiaddons)
+       ("ki18n" ,ki18n)
+       ("kiconthemes" ,kiconthemes) ; for optional kde-frameworkintegration
+       ("kpackage" ,kpackage)
+       ("kwayland" ,kwayland) ; optional
+       ("kwindowsystem" ,kwindowsystem)
+       ("qtbase" ,qtbase)
+       ("qtdeclarative" ,qtdeclarative) ; optional
+       ("qtx11extras" ,qtx11extras)))
+    (home-page "https://invent.kde.org/plasma/breeze")
+    (synopsis "Default KDE Plasma theme")
+    (description "Artwork, styles and assets for the Breeze visual style for
+the Plasma Desktop.  Breeze is the default theme for the KDE Plasma desktop.")
+    (license license:gpl2+)))
+
 (define-public kdecoration
   (package
     (name "kdecoration")